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Why does popcorn pop?

Tiny Pressure Bombs
Why does popcorn pop?
You're heating up a bag of popcorn, and suddenly — ~~BAM BAM BAM~~ — the kernels are **exploding like tiny fireworks**.

You're heating up a bag of popcorn, and suddenly — BAM BAM BAM — the kernels are exploding like tiny fireworks. What's going on in there?

Every popcorn kernel is like a tiny pressure cooker. Inside that hard shell is a drop of water and some starch. The shell is the secret: it's tough enough to trap everything inside, even when things get wild.

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